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arXiv 2211.09474hep-phhep-ex
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过渡GPD和$π-Δ(1232)$最终状态的排他性电生产

Transition GPDs and exclusive electroproduction of $π-Δ(1232)$ final states

Peter Kroll, Kornelija Passek-Kumerički

摘要:

我们调查独家电生产的$π^-Δ^{++}$内的手提包的方法,其中的螺旋度振幅分解成广义部分子分布(GPD)和硬部分子过程。我们定义了$p-Δ$横截GPD,而螺旋度非翻转GPD取自文献。对于观测值的数值估计,我们利用大$N_C$结果,以便将一些$p-Δ$ GPD与质子-质子GPD联系起来,而忽略所有其他GPD。在计算扭转2和扭转3子过程振幅时,我们考虑了夸克横动量和Sudakov假设。在大- $N_C$极限下预测了$γ^*p\to π^-Δ^{++}$的部分截面。

英文摘要:

We investigate exclusive electroproduction of $π^-Δ^{++}$ within the handbag approach in which the helicity amplitudes factorize into generalized parton distributions (GPDs) and hard partonic subprocesses. We define the $p-Δ$ transversity GPDs while the helicity non-flip GPDs are taken from the literature. For the numerical estimates of observables we utilize large-$N_C$ results in order to relate a few of the $p-Δ$ GPDs to the proton-proton ones and neglect all other GPDs. In the calculation of the twist-2 and twist-3 subprocess amplitudes we take into account quark transverse momenta in combination with Sudakov suppressions. The partial cross sections for $γ^*p\to π^-Δ^{++}$ are predicted in the large-$N_C$ limit.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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